
The Swiss arch, also called a link arch, is used for larger roof projections as a connection between gutter and downpipe. With an almost right-angled tube knee and the cylindrical design, the conditions are not exactly ideal. For example, there is a risk of blockage and the drainage behavior could also be better. Nevertheless, Swiss arches, along with gutter pots, are considered the jewels of any roof drainage system. Since time immemorial, they have adorned many buildings and channel rainwater from the gutter into the pipe with timeless beauty and elegance. For us tinsmiths, Swiss bends also offer the opportunity to show what we can do. Unfortunately, in reality it often looks different: Take measurements, call the wholesaler and shortly thereafter assemble the industrially manufactured water deflector. Industrially manufactured elbows are usually in two parts and consist of a pipe angle and a pipe elbow, which is drawn in (folded) on one side by a special process. The expanded elbow and the elbow are simply plugged together. To be noted:
- The plug-in connection at the 87° angle must be made watertight.
- The poorer drainage behavior must be taken into account in the channel calculation.
Is manual work still up to date?
Are we assemblers or craftsmen? Of course, the purchased link arc is perfectly manufactured and more economical, but the decisive factor is that old knowledge is increasingly lost. In addition, the industry is at its wit’s end at the latest with the tapered design. A plumber who masters his craft must know certain activities and working techniques. This also includes designing and fabricating a Swiss bow. In order to impart these skills and expertise, there are the inter-company apprentice training courses, known as ulus for short. There, skills are taught that are not sufficiently taught in the specialized companies. It is mostly old techniques that young plumbers repeatedly fail to understand. Those who master these working techniques are much less likely to have problems on the construction site. In addition, the ulus also teach new techniques and materials such as foil roofs and liquid plastics.